One day, Ayumi, a mother of three sons, discovers an adult DVD in her son's study desk. As punishment, she makes him watch her masturbate in front of him, but seeing his pitiful expression, she ends up helping him instead. Later, she notices her second son secretly watching her masturbate, so she gently invites him to sit beside her and seduces him. Overcome by mounting desire, Ayumi finally reaches out to her sleeping third son. This scene unfolds amidst a turbulent mix of emotions that challenges the very nature of family.